ML20028E814

LER 82-050/03L-0:on 821231,primary Coolant Activity Found Above Limit of Uci Per G Dose Equivalent I-131.Caused by Small Number of Degraded Fuel Pins.Iodine Concentration Decreased

ML20028E814
Person / Time
Site:	Millstone
Issue date:	01/21/1983
From:	Borchert R NORTHEAST NUCLEAR ENERGY CO.
To:	NRC OFFICE OF INSPECTION & ENFORCEMENT (IE REGION I)
Shared Package
ML20028E806	List: ML20028E805 ML20028E814
References
LER-82-050-03L, LER-82-50-3L, NUDOCS 8301280216
Download: ML20028E814 (2)

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EVENT DESCRIPTION AND PROSABLE CONSEQUENCES h I

8 l Following a reactor shutdown on 31 December 19R2. surupillanca + e+4nn 4nem,i y rimmi l activity of >l.0 microcuries per gram Dose Equivalent Iodfne-131 (0.E.* I-131) in the i

, , i primary coolant. For approximately 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, the activity was above the limits nut- I gi lined in T.S. 3.4.8.a,1.0 microcuries per gram D.E. I-131, and has since decreased I o . l to a value < 0.2 microcuries per gram D.E. I-131. Previous LER's: 82-19. 82-28 and - 1 o > L82 -38.

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43 44 47 34 as 37 40 42 CAUSE DESCRIPTION AND CORRECTIVE ACTION'4 27 i o 1 The higher than allowable Iodine concentration is believed to be caused by a small I

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ATDO1 MENT TO LER 82-50/03L-0 NOMEMI NUCT.FAR MERGY CWPANY MTTLW NUCT. EAR PCWER STATICN - UNIT 2 FACILITY OPERATING LICENSE NLNBER DPR-65 '

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1. Reactor power history, 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> prior to event:

Millstone 2 was operating at 100% power until 2330, 30 December 1982, when it pre _ to go to Startup Mode in order to repair several secondary side steam leaks.

2. Fuel Burnup by core region:

The Millstone 2 core consists of 3 regions and a center assembly. The most.

burned region, consisting of Cmbustion Engineering manufactured fuel, had a burnup of 30980 MiD/M.

i h next region, ocasisting of the laading Westinghouse fuel, had a burnup of 18640 MdD/M.

The new fuel, also manufactured by Niestinghouse, had a burnup of 7410 MdD/ M . ,

The center assably, consisting of a single reinsert assenbly, was man-ufactured by Ccnbustion Engineering and had a burnup of 24830 MiD/M.--

3. Coolant purification flow was approximately 80 gpn during the 48 hours5.555556e-4 days <br />0.0133 hours <br />7.936508e-5 weeks <br />1.8264e-5 months <br /> pr M ing the event.

4. There was no history of degassing operaticos in the period prMhg the event.

5. h duration that the primary coolant exceeded 1.0 microcuries per gram Dose l]uivalent Iodine-131 was approximately 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br /> on 31 M r 1982.

l Time /Date of Sanple Microcuries per gram D.E. I-131 0130/31 Deer 1982 0.047 0450/31 Decenber 1982 0.022 1000/31 Dece ber 1982 0.783 1345/31 Dece ber 1982 1.216 1745/31 Dece h

• 1982 1.204 i

2147/31 December 1982 1.073 1045/1 January 1983 0.882 0545/1 January 1983 0.755 i

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